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In this tutorial, we will learn about how to create a program in C that can convert any given binary number (by user at run-time) into
its equivalent octal number. At last we have also created a function named **BinToOct()** that does
the same job.

But before going through the program, if you are not aware of

- Binary Number
- Octal Number
- Binary to Octal Conversion

then refer to Binary to Octal conversion step by step process. Now let's move on to the program.

The question is, **Write a program in C that converts any given binary number into its equivalent octal value**. The answer to this question is:

#include<stdio.h> #include<conio.h> int main() { int bin, oct=0, i=0, mul=1, count=1, rem, octnum[20]; printf("Enter any Binary Number: "); scanf("%d", &bin); while(bin!=0) { rem = bin%10; oct = oct + (rem*mul); if(count%3==0) { octnum[i] = oct; mul = 1; oct = 0; count = 1; i++; } else { mul = mul*2; count++; } bin = bin/10; } if(count!=1) octnum[i] = oct; printf("\nEquivalent Octal Value = "); for(i=i; i>=0; i--) printf("%d", octnum[i]); getch(); return 0; }

As the above program was written under **Code::Blocks** IDE, therefore after successful build and run, here is the first snapshot
of the sample run:

Now supply any binary number say **1101110** as input and press ENTER key to see its equivalent octal value as shown in the
second snapshot of the sample run given below:

Here is the final snapshot of another sample run:

- Receive any binary number from user at run-time say
**1101110** - Create a while loop that runs until the value of binary number (
**bin**) becomes 0 - At first run,
**bin**(1101110) is not equal 0, therefore program flow goes inside the loop - And
**bin%10**or**1101110%10**or**0**gets initialized to**rem**,**oct + (rem*mul)**(we have initialized 0 to**oct**and 1 to**mul**at start of the program) or**0 + (0*1)**or**0**gets initialized to**oct** - We have initialized 1 to
**count**at start of the program, therefore at first run, the value of**count**is not equal to 3, therefore while dividing the value of**count**or**1**with 3, we will not get a remainder as 0, therefore program flow goes inside the else block (as the condition of if statement evaluates to be false at first run of**while**loop), and inside the**else**block,**mul*2**or**1*2**or**2**gets initialized to**mul**, and the value of**count**gets incremented and becomes 2 - At last,
**bin/10**or**1101110/10**or**110111**gets initialized to**bin**, and again program flow goes back to the**while**loop's condition - Therefore,
**bin!=0**or**110111!=0**evaluates to be true, therefore program flow again goes inside the loop - And
**bin%10**or**110111%10**or**1**gets initialized to**rem**, and**oct + (rem*mul)**or**0 + (1*2)**or**2**gets initialized to**oct** - Again the condition of
**if**statement, that is**count%3==0**or**2%3==0**evaluates to be false, therefore program flow goes inside the**else**block, and**mul*2**or**2*2**or**4**gets initialized to**mul**, and the value of**count**gets incremented and becomes 3 - At last,
**bin/10**or**110111/10**or**11011**gets initialized to**bin**, and again program flow goes back to the loop's condition - Therefore,
**bin!=0**or**11011!=0**evaluates to be true, therefore program flow again goes inside the loop - And
**bin%10**or**11011%10**or**1**gets initialized to**rem**, and**oct + (rem*mul)**or**2 + (1*4)**or**6**gets initialized to**oct** - Now the condition of
**if**statement, that is**count%3==0**or**3%3==0**evaluates to be true, therefore program flow goes inside the**if**block, and**oct**or**6**gets initialized to**octnum[i]**(we have initialized 0 to**i**at start of the program) or**octnum[0]**, and 1, 0, 1 gets initialized to**mul**,**oct**,**count**respectively. And the value of**i**gets incremented and becomes 1 - At last,
**bin/10**or**11011/10**or**1101**gets initialized to**bin**, and again program flow goes back to the loop's condition - Therefore,
**bin!=0**or**1101!=0**evaluates to be true, therefore program flow again goes inside the loop and follow the same procedure as told above - After exiting from the
**while**loop, check whether the value of**count****is not equal to 1**or not, if it is, then the value of**oct**gets initialized to the last index of**octnum[]**array - Finally print the value of of octal digit one by one from last index to first index

The question is, **Write a program in C that converts Binary to Octal using user-defined function named BinToOct()**.
Here we have declared the variable **i** and the array **octnum[20]** as global variable (out from both the function) to make it
known inside both the function that is **main()** and **BinToOct()** function.

#include<stdio.h> #include<conio.h> void BinToOct(int bin); int i=0; int octnum[20]; int main() { int binnum; printf("Enter any Binary Number: "); scanf("%d", &binnum); BinToOct(binnum); printf("\nEquivalent Octal Value = "); for(i=i; i>=0; i--) printf("%d", octnum[i]); getch(); return 0; } void BinToOct(int bin) { int oct=0, mul=1, count=1, rem; while(bin!=0) { rem = bin%10; oct = oct + (rem*mul); if(count%3==0) { octnum[i] = oct; mul = 1; oct = 0; count = 1; i++; } else { mul = mul*2; count++; } bin = bin/10; } if(count!=1) octnum[i] = oct; }

Here is the final snapshot of above program's sample run:

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